Process for obtaining threads of artificial silk, films, and other objects.



UNITED Sllliiilliiilid li lii .flllilliiill" (EiFFICE.

LEON LEDUG, 013 CUUTURE GIFiRMfiJIN. 23.13513 HENEFWI JACQUEMIN, OF MARdITSART, "BELGIUM.

PROCEES FUR UB'I'AINING THREADS 0F $.BTIFIQI13I; $753135, JEILMS, A ND DTHEE OBJECTS.

No I rawing".

i Heft it:

i893 that soatlimn irlilorii'l prci'ripii'ntus the t-zuntlioguniito of ullculi cellulose from nque- (ms solution or viscose, hut 'witi'iout decomposing it and have hasrd on tu' fact ii process "for the. pin-ii on of viscose. Although this property has been known tor such a long tiuu'. no inwuiru' has ii -Jon able to utilizo sodium ohlorid own with this iiddi-- tion of on ui'rid oiilior str ng or \vonl: so to preri 'iituto viscose us HHhSiZHIWB suitable for the nuiuu'fiu-tiu'i': of threads of artificial silk, of pliotogrupi'iio films or othvr similar ohjoot of rug: ioi'utoifl mrlluloso.

Patents ll llilllfz to pm. "iitiition truths are. howovor numerous: o (ill-Bf of them claim. tho nmmoninvui suits, sulfuric acid with the addition of a. suit, or acid salts such as tho bi'suli'ates. The others relate to the ML dition to those oaths of uocossory substances such as glucose, tho suliilos, etc... for diiioi out purposes.

Tho object of the present invention is precipitation hath composed of a. salt. other than the auiu'ioniaoal suit-s and of a strong mineral :ioid other than sulfurio acid, by Whirh'u relatively slow precipitation is insurod and :1 slow rogonorution of tho cellulose.

\Vo have i'oimii :i mixturo of 9 liters oi u solution oi? sodium chlorid (NaCl) sutuut. ordinary temperature and one liior oi mm-outratod oomi'noroial hjwlroohlorio iicid, \\'lll('ll mixture consequently contains 3 to 4% fn-o TlCl, to be particularly suitable.

'lho precipitation hath should only be Sp r-animation of Lettors la'ten 4:.

Application file ii. Mint-h 14,

lutoitod Fob. 6* 1917.

Saris] No. rotate.

hunted.

tho violent lihrmtion of gas I id tho like!) and thus we obsmooth, lui-i .rous mad solid fiber. A luv/r also for i that it is not indisole to soiij il 6 row viscose to a prolimiuiiry pun rig probes-s; it should ho'iioi'c r :ii'i suitable composition, niiiaou ri l. ii'i} Within wide limits.

law-1 rial. v'isociso cow 210E150 100 kilos of volluloso and 10 to 13: kilos of cellulose in 109 kilos of viscose. When the operation is oni carried on in a. bath composed as mentioned above of sodium clilorid. and hydrochloric acid which amp y sutlioes for the. co iiggulution process, the'acoessory products of tho viscose decomposed by the coagulation hath are partly deposited on the thread giving it u ln-ick red tin: which further inormsezs in intensity if the: thread is left in the open air for some time.

In order consequently to void those im- 'mrities which have. no othrr disadvantage than to render the twist ing a. little less easy, we, have found it advantageous to pass the thread through a second bath, of the same composition as the first.

"We are assured by proceeding in this manner that in spite of the gradual weakeningz oi the first bath, tho thread will always ho suitably cougulated b )fore nrrivinga-t thQ holihin. at the reel or other apparatus on wh'u-h it is Wound.

This second hath is 1' 0t weakened. and is only slightly soiled; it nun therefore finally serve as tho first bath. The latter? ma also moreover he regonemteo by the addition of hydrochloric acid. after filtration or decanl'ution of the impurities.

W but we claim and desire to secure by Letters Patent oi the United States is 1. A process of formin g filaments com rising subjecting viscose to a precipitation nth composed of a solution of sodium chlorid with the addition of hydrochloric acid, substantially as described.

The roiutivoly low tempora A n ocess of forn'ling filaments comprising subjecting viscose to a precipitation bath gmnposed of a solution of sodium ehlorid and.hydrochloric acid in the proportion of 5 'iiters of a concentrated solution of sodium eiiiorid to 1 liter of concentrated commercial hydrochloric acid containing about 4 per wot. hydrochloric aci n In witness whereof we have hereunto set our hands 1n the presence of two wltnesses.

LEON LEDUC. HENRI JACQUEMIN. Witnesses i I CHAS. ROY NASMITH, CHARLES A. JOHNSON. 

